interpolate
verb (used with object)
to introduce (something additional or extraneous) between other things or parts; interject; interpose; intercalate.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
To make the notorious Jerusalem passages readable, Steinsaltz is interpolating words into the text, marking additions in a lighter typeface so readers can discern the original.
From Time Magazine Archive
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